Steel tank wiring block

[Richard Colahan]

Good day...
I'm restoring an iron barrel steel tank (V1225) and have a question re: the 4 wires coming from the flywheel magneto.
It looks like the blue wire connects to the coil, so I'll also splice in a kill button to that wire also.

Can someone provide me info on the other 3 wires?
They are:
Green, with some red
Grey
Yellow, with some red

Primarily, which of these can serve as a feed for the headlight and tail light?
thanks for any help.
-Richard Colahan